Nonlinear optical properties of multilayered structures and composites of C60 with electron donors

摘要

Abstract: Second and third order nonlinear optical properties of C$- 60$/ based composites and multilayered structures with TPP and TPN are studied by transverse optical second and third harmonic generation, respectively. The results are compared with those obtained from pristine, photolyzed in vacuum and in oxygen atmosphere C$-60$/ thin films. Second harmonic generation is observed from structures containing C$-60$/ molecules. An enhancement of the quadratic susceptibility is observed from the multilayered structures. The third harmonic generation experiments show an enhancement of the cubic susceptibility from photolyzed C$-60$/ thin films. No increase of $chi$+(3)$/ in the multilayered structures or composites is observed. A slightly larger response is obtained with the multilayered thin films as compared to the composite material. !40